使用讯飞SDK问题求助

Creator 2.x
#1

在cocos creator 中使用讯飞SDK，根据官方文档，操作如下：
1、将下载的SDK中libs文件夹下的所有文件都复制到了项目目录：build\jsb-default\frameworks\runtime-src\proj.android\libs
2、在AndroidManifest.xml添加权限
3、添加代码，片段如下：

import com.iflytek.cloud.SpeechUtility;
import com.iflytek.cloud.SpeechRecognizer; //语音听写对象
import com.iflytek.cloud.RecognizerListener;
import com.iflytek.cloud.LexiconListener;
import com.iflytek.cloud.RecognizerResult;
import com.iflytek.cloud.SpeechError;
import com.iflytek.cloud.SpeechConstant;
import com.iflytek.cloud.ErrorCode;

public class AppActivity extends Cocos2dxActivity {
        private static AppActivity app = null;
        // 语音听写对象
        private static SpeechRecognizer mIat;
        // 引擎类型
        private String mEngineType = SpeechConstant.TYPE_CLOUD;
        //消息提示
        private static Toast mToast;
        
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SDKWrapper.getInstance().init(this);
                app = this ;
                //讯飞语音初始化
                SpeechUtility.createUtility(AppActivity.this, "appid=58de6966");
              //mIat = SpeechRecognizer.createRecognizer(app.getContext(), null);  这里创建返回NULL
    }
        
        public static void onVoiceStart(int i)throws Exception{
                mIat = SpeechRecognizer.createRecognizer(app.getContext(), null); //这里创建同样返回NULL
                if(mIat == null){
                        showTip("mIat is null.");
                        return;
                }
                mIat.setParameter(SpeechConstant.DOMAIN,"iat");
                mIat.setParameter(SpeechConstant.LANGUAGE,"zh_cn");
                mIat.setParameter(SpeechConstant.ACCENT,"manderin");

        }

。。。。。。。
请大家帮我看看，为什么创建不了对象，哪里出问题了，谢谢！